1664404233 has 8 divisors (see below), whose sum is σ = 2238845088. Its totient is φ = 1099783104.

The previous prime is 1664404213. The next prime is 1664404241. The reversal of 1664404233 is 3324044661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1664404233 - 2⁵ = 1664404201 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1664404194 and 1664404203.

It is not an unprimeable number, because it can be changed into a prime (1664404213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2454535 + ... + 2455212.

It is an arithmetic number, because the mean of its divisors is an integer number (279855636).

Almost surely, 2^1664404233 is an apocalyptic number.

It is an amenable number.

1664404233 is a deficient number, since it is larger than the sum of its proper divisors (574440855).

1664404233 is a wasteful number, since it uses less digits than its factorization.

1664404233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4909863.

The product of its (nonzero) digits is 41472, while the sum is 33.

The square root of 1664404233 is about 40797.1105962175. The cubic root of 1664404233 is about 1185.0943762183.

Adding to 1664404233 its reverse (3324044661), we get a palindrome (4988448894).

The spelling of 1664404233 in words is "one billion, six hundred sixty-four million, four hundred four thousand, two hundred thirty-three".